Reaction time test
Wait for green. Then tap.
Five tries. The gap before green is random, so you cannot guess it. Tap early and that try starts again.
Your five
Reading your number
- It is a comparison with yourself. Your screen, browser and device each add a few milliseconds of their own, so a score here is not directly comparable with someone else’s on a different phone.
- The average matters more than the best. One lucky tap is easy. Five steady ones are harder.
- Expect it to move. Tiredness, caffeine, distraction and even how you are holding the phone all shift it.
- Early taps count against focus, not speed. Jumping the gun means you were guessing the timing instead of watching for the change.
How the test works
- Tap the panel. It turns red and says wait.
- After a random pause of one and a half to four seconds it turns green.
- Tap as soon as you see green. The time from the colour change to your tap is recorded in milliseconds.
- After five clean tries you get each time, the average and your best.
A game for curiosity and practice. It is not a medical, driving or fitness-to-work test.
More than one reflex
Four fast, different games a day.
SkillArena is a skill game for iPhone and iPad. Each day’s Daily Arena mixes four short games from focus, memory, reasoning, numbers, careful reading and clear wording, in about four minutes.
Difficulty adapts to how you play, and there are thirteen games in all, including Deep Focus, a 30-trial go/no-go precision game: tap on go, hold on no-go.
Get SkillArena on the App StoreFree to download; see the App Store listing for what is included and any optional upgrades. Requires iOS 18 or later. Details checked against the App Store listing on November 10, 2026.
Publisher disclosure: Honest Little Apps publishes both SkillArena and this page. This is not an independent review. This page is a separate web companion, not a feature of the app. This reaction test is not one of the app’s games. SkillArena is a game, not a cognitive assessment.
Questions
How do you test your reaction time?
Wait for a signal you cannot predict, then respond as fast as you can and measure the gap. Here the panel turns green after a random pause, and the time until your tap is recorded in milliseconds over five tries.
Why is my reaction time different on my phone and my computer?
Touchscreens, mice, displays and browsers each add their own small delays, and they differ between devices. Use the same device each time if you want to compare scores.
Can you improve your reaction time?
You can get more consistent with practice and by being rested and undistracted. Much of what improves is anticipation and attention, which is why the pause before green is random.
What happens if I tap too early?
That try does not count and starts again. Tapping before green means you were predicting, not reacting.
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